ORA-23404 refresh group does not exist Cause: A refresh group name was given that is not in SYS.RGROUP$. Action: Provide a refresh group name that is in SYS.RGROUP$ or DBS_RGROUP.
Reference: Oracle Documentation
Example: Today I faced this error on my DB, as I was trying to refresh a MVIEW using DBMS_REFRESH.REFRESH - EXEC DBMS_REFRESH.REFRESH('MYMVIEW'); But when I explorered and find DBMS_REFRESH.REFRESH refreshes a refresh group. So I canged my statemanet to - EXEC DBMS_MVIEW.REFRESH('MYMVIEW'); and it worked !!! Another way is to make a Refresh Group first and then Refresh it using DBMS_REFRESH.REFRESH as - EXEC DBMS_REFRESH.MAKE(NAME=>'MY_GRP', LIST=>'MYMVIEW', NEXT_DATE => SYSDATE, INTERVAL => 'NULL'); - EXEC DBMS_REFRESH.REFRESH('MY_GRP');